Fix a lot of FIXMEs

hm/common.nix

@@ -238,7 +238,8 @@ in
       };
       # TODO highlight or bat
       nix-index = {
-        enable = true;
+        enable = false; # TODO Index is impossible to generate, should use https://github.com/nix-community/nix-index-database
+        # but got no luck without flakes
         enableZshIntegration = true;
       };
       less.enable = true;
@@ -398,8 +399,6 @@ in
       # terminal essentials
       moreutils
       man
-      # nodePackages.insect # FIXME Don't install on aarch64
-      # TODO Use whatever replaces insect
       unzip
       unrar
       p7zip
@@ -448,6 +447,9 @@ in
 
       # TODO Lots of redundancy with other way things are defined here
 
+    ] ++ lib.optionals pkgs.stdenv.isx86_64 [
+      nodePackages.insect
+      # TODO Use whatever replaces insect, hopefully that works on aarch64
     ];
     sessionVariables = {
       # Favourite commands